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Manufacturers have devised beam-tracking systems to stabilize the position of the X-ray beam to minimize the radiation wasting effect of focal spot motion (Toth et al. 2000). Scattered radiation is formed by the interaction of the primary beam with the patient. Scattered radiation exits in all directions and, if detected, reduces contrast and generates artifacts. In plain chest radiography, depending on the technique chosen, Radiation Exposure in Thoracic CT between 50 and 90% of ﬁlm darkening is due to scattered radiation, contributing to the low soft tissue contrast of this technique (Curry et al.

17. To maintain complete volume coverage, image sub-volumes reconstructed in consecutive heart cycles have to ﬁt together in the transverse direction. As a consequence, the spiral pitch has to be limited for ECG-gated multi-slice CT examinations of the heart (Ohnesorge et al. 2000). If the table moves too fast, gaps between the image sub-volumes occur, which have to be closed by far-reaching interpolations at the expense of a loss of transverse resolution and a degradation of the SSPs. In theory, the spiral pitch could be adapted to the patient’s heart rate.

T. Flohr et al. for a larger number of slices. Simulated CT data of an anthropomorphic heart phantom with contrastenhanced coronary arteries containing atherosclerotic plaques and stents was used to investigate the limits of the ACV approach for scanning with signiﬁcantly more than 4 slices. 18 shows two cross sections along the right and the left coronary artery (RCA and LAD) of the mathematical heart phantom: this is the “ideal image” which serves as a quality benchmark. 375 (table feed 3 mm/s).